So it makes sense to be able to say, look for many methods I do want to have a way of doing comparison, and I don't have to remember, at top level, what the name of the comparison method was.
所有我需要的对象进行操作,那么就可以这么说了,我想要在很多方法里面,去找做比较的方法,我并不需要记住,每一个比较的方法的名字。
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